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Sato Takanori
| Faculty of Information Science and Technology Media and Network Technologies Information Communication Systems | Associate Professor |
Takanori Sato was born in Hokkaido, Japan, in 1992. He received his Ph.D. degree in the field of media and network technologies from Hokkaido University, Japan, in 2018. He was a Research Fellow of Japan Society for the Promotion of Science (JSPS) from 2017 to 2019. In 2019, he moved to University of Hyogo as an assistant professor. He is currently an associate professor in Hokkaido University. His research interests include the theoretical and numerical studies of optical fibers and photonic circuits using the coupled mode theory and the finite element method. He is a member of the Institute of Electronics, Information, and Communication Engineers (IEICE), the Japan Society of Applied Physics (JSAP), Institute of Electrical and Electronics Engineers (IEEE), and the Optical Society of America (OSA).
Researcher basic information
■ Degree■ URL
researchmap URLホームページURL■ Various IDs
Researcher number
- 60835809
- AAF-8645-2019
Research Keyword
- Radio-over-fiber Communication
- Optical Fiber
- All-optical signal processing
- Optoelectronics
- Optical devices
- Nonlinear optics
- Silicon photonics
- Photonic integrated circuits
- Finite element method
- Photonic crystal
- Bachelor's degree program, School of Engineering
- Master's degree program, Graduate School of Information Science and Technology
- Doctoral (PhD) degree program, Graduate School of Information Science and Technology
Career
■ CareerCareer
- Apr. 2020 - Present
Hokkaido University, Graduate School of Information Science and Technology, Associate Professor, Japan - Apr. 2019 - Mar. 2020
University of Hyogo, Graduate school of engineering, Assistant professor, Japan - Apr. 2018 - Mar. 2019
Japan Society for the Promotion of Science (JSPS), Research Fellowship for Young Scientists(PD) - Apr. 2016 - Mar. 2019
Hokkai Gakuen University, Faculty of Engineering, Part-time Lecturer - Apr. 2017 - Mar. 2018
Japan Society for the Promotion of Science (JSPS), Research Fellowship for Young Scientists(DC2)
- Jun. 2025 - Present
電子情報通信学会 光ファイバ応用技術研究会(OFT), 専門委員, Society - Jan. 2025 - Present
IEEE Sapporo Section, Secretary/Treasurer, Society - Jan. 2025 - Present
IEEE Sapporo Section Young Professionals Affinity Group, Vice Chair, Society - Jan. 2024 - Present
IEEE Sapporo Section, Executive Committee Members, Society - Dec. 2023 - Present
電子情報通信学会 光通信インフラの飛躍的な高度化に関する特別研究専門委員会(EXAT), 専門委員, Society - Nov. 2023 - Present
Optoelectronics and Communications Conference / International Conference on Photonics in Switching and Computing 2025 (OECC/PSC 2025), 運営委員会 会場委員, Society - Jun. 2023 - Present
電子情報通信学会北海道支部, 支部運営委員, Society - Jan. 2023 - Dec. 2024
IEEE Sapporo Section Young Professionals Affinity Group, Chair, Society - Apr. 2020 - Dec. 2022
IEEE Sapporo Section Young Professionals Affinity Group, Vice Chair, Society
Research activity information
■ Awards- Mar. 2023, Institute of Electronics, Information and Communication Engineers (IEICE), Young Researcher's Award
Takanori Sato - Sep. 2018, 電子情報通信学会, エレクトロニクスソサイエティ学生奨励賞
佐藤孝憲 - Mar. 2018, 電子情報通信学会北海道支部, 平成29年度北海道支部学生奨励賞
佐藤孝憲 - Feb. 2016, The 2015 IEEE Sapporo Section Encouragement Award
佐藤孝憲
- Random Polarization-Mode Coupling Effects in Heterogeneous Multi-Core Fibers With Different Cladding Diameters
Gustavo Ocampo; Takanori Sato; Mayu Iizuka; Kunimasa Saitoh
Journal of Lightwave Technology, 42, 16, 5674, 5680, Institute of Electrical and Electronics Engineers (IEEE), 15 Aug. 2024, [Peer-reviewed], [International Magazine]
Scientific journal - Design of a mode-dependent-loss controller using a long-period fiber grating with coating material for a 2LP-mode transmission system
Takumi Kimura; Takanori Sato; Masaki Wada; Takayoshi Mori; Taiji Sakamoto; Ryota Imada; Takashi Matsui; Kazuhide Nakajima; Kunimasa Saitoh
Journal of the Optical Society of America B, 41, 9, 1960, 1960, Optica Publishing Group, 08 Aug. 2024, [Peer-reviewed], [International Magazine]
Scientific journal, We designed a mode equalizer to handle mode-dependent loss (MDL) in mode division multiplexing systems. The proposed equalizer is based on a step-index long-period fiber grating (LPFG) and designed to attenuate the LP01 core mode while providing high transmission of the LP11 core mode. For a practical fiber design, we assumed a coating material with a higher refractive index than the cladding. Consequently, numerous leaky cladding modes should be analyzed. This study focuses on identifying the optimal core parameters to efficiently equalize MDL. - Optical Mode Multiplexer Using LiNbO<sub>3</sub> Asymmetric Directional Coupler Enabling Voltage Control for Phase-Matching Condition
Shotaro YASUMORI; Seiya MORIKAWA; Takanori SATO; Tadashi KAWAI; Akira ENOKIHARA; Shinya NAKAJIMA; Kouichi AKAHANE
IEICE Transactions on Electronics, E107.C, 5, 146, 149, Institute of Electronics, Information and Communications Engineers (IEICE), 01 May 2024, [Peer-reviewed], [International Magazine]
Scientific journal - A silicon mode multiplexer based on the three-stage cascaded wavelength insensitive coupler for MDM-WDM transmission system
Kodai Nakamura; Takanori Sato; Kunimasa Saitoh
IEICE Electronics Express, 21, 7, 20240065, 20240065, Institute of Electronics, Information and Communications Engineers (IEICE), 10 Apr. 2024, [Peer-reviewed], [International Magazine]
Scientific journal - Tunable O-band high-tolerance silicon mode multiplexer based on phase-mismatched asymmetric directional couplers
Kodai Nakamura; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh
Journal of the Optical Society of America B, 41, 5, 1106, 1106, Optica Publishing Group, 09 Apr. 2024, [Peer-reviewed], [International Magazine]
English, Scientific journal, Small silicon-on-insulator (SOI)-based tunable O-band TE0-TE1 and TE0-TE2 mode multiplexers (MUXs) based on phase-mismatched asymmetric directional couplers (ADCs) are theoretically and experimentally demonstrated. We designed ADCs with an intentionally phase-mismatched coupling region to suppress wavelength dependence and improve fabrication error tolerance. The fabricated O-band TE0-TE2 mode MUX can maintain more than −0.71dB transmission by heating. Moreover, we proposed three-section tapered ADCs (3STADCs) divided into three regions. We theoretically show that the TE0-TE1 and TE0-TE2 mode MUXs based on the 3STADC have more than −0.28dB and −0.36dB transmission within ±10nm waveguide width fabrication error, respectively. - High tolerant design of athermal Si wavelength filter using Mach–Zehnder interferometer
Takanori Sato; Kengo Maeda; Yusuke Sawada; Takuya Mitarai; Takuo Hiratani; Takuya Okimoto; Tsutomu Ishikawa; Naoki Fujiwara; Hideki Yagi; Kunimasa Saitoh
Japanese Journal of Applied Physics, 63, 4, 04SP55, 04SP55, IOP Publishing, 01 Apr. 2024, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
Scientific journal, Abstract
A design method for the athermal Mach–Zehnder wavelength filter, which is available in the Si-on-insulator platform, is proposed. We can obtain much higher fabrication-tolerant characteristics by introducing a condition, minimizing the dependence of the waveguide width on the athermal condition, to the wavelength filter design. Our design has the arm waveguides divided into four sections, and each section is appropriately designed to exploit athermal characteristics. We also reveal the relationship between the arm length (corresponding to the footprint) and the waveguide width (relating to the propagation loss) from the formularized equations for the wavelength filter design. One example of the Mach–Zehnder interferometer filter designed by the proposed method has lower spectral shift characteristics less than 1 pm K−1 entire C band even if the waveguide width errors occur, compared with the conventional design. - Strategies for DOA-DNN estimation accuracy improvement at low and high SNRs
Daniel Akira Ando; Toshihiko Nishimura; Takanori Sato; Takeo Ohgane; Yasutaka Ogawa; Junichiro Hagiwara
IEICE Transactions on Communications, 1, 17, Institute of Electrical and Electronics Engineers (IEEE), 2024, [Peer-reviewed], [International Magazine]
Scientific journal - Variable Mode-Dependent-Loss equalizer based on Silica-PLC for Three-Mode transmission
Takayoshi Mori; Takeshi Fujisawa; Junji Sakamoto; Yoko Yamashita; Taiji Sakamoto; Ryota Imada; Ryoto Ima; Takanori Sato; Kei Watanabe; Ryoichi Kasahara; Toshikazu Hashimoto; Kunimasa Saitoh; Kazuhide Nakajima
Optical Fiber Technology, 81, Dec. 2023, [Peer-reviewed]
Scientific journal - Deep Neural Networks Based End-to-End DOA Estimation System
Daniel Akira ANDO; Yuya KASE; Toshihiko NISHIMURA; Takanori SATO; Takeo OHGANE; Yasutaka OGAWA; Junichiro HAGIWARA
IEICE Transactions on Communications, E106.B, 12, 1350, 1362, Institute of Electronics, Information and Communications Engineers (IEICE), 01 Dec. 2023, [Peer-reviewed]
Scientific journal - Broadband design of silica-PLC mode-dependent-loss equalizer for 2LP-mode transmission systems
Takanori Sato; Masaki Wada; Takayoshi Mori; Taiji Sakamoto; Ryota Imada; Takashi Matsui; Kazuhide Nakajima; Kunimasa Saitoh
Optics Express, 20 Nov. 2023, [Peer-reviewed], [Lead author, Corresponding author]
Scientific journal - Performance Analysis of DNN-PCA for DOA Estimation with Three Radio Wave Sources
Daniel Akira Ando; Toshihiko Nishimura; Takanori Sato; Takeo Ohgane; Yasutaka Ogawa; Junichiro Hagiwara
2023 22nd International Symposium on Communications and Information Technologies (ISCIT), IEEE, 16 Oct. 2023, [Peer-reviewed]
International conference proceedings - Investigation of double-cladding heterogeneous step-index 2LP-mode multicore fiber with a two-ring layout
Zheyu Zhao; Takanori Sato; Takeshi Fujisawa; Taro Iwaya; Yuto Sagae; Taiji Sakamoto; Takashi Matsui; Kazuhide Nakajima; Kunimasa Saitoh
Journal of the Optical Society of America B, 01 Oct. 2023, [Peer-reviewed]
Scientific journal - Smart Radio Environments with Intelligent Reflecting Surfaces for 6G Sub-Terahertz-Band Communications
Yasutaka OGAWA; Shuto TADOKORO; Satoshi SUYAMA; Masashi IWABUCHI; Toshihiko NISHIMURA; Takanori SATO; Junichiro HAGIWARA; Takeo OHGANE
IEICE Transactions on Communications, E106.B, 9, 735, 747, Institute of Electronics, Information and Communications Engineers (IEICE), 01 Sep. 2023, [Peer-reviewed], [Invited]
Scientific journal - Bayesian design of mosaic-based mode multiplexers for various wavelength bands
Takeshi Fujisawa; Takuya Mitarai; Takuya Okimoto; Naoya Kono; Naoki Fujiwara; Takanori Sato; Hideki Yagi; Kunimasa Saitoh
Optics Express, 31, 16, 26842, 26842, Optica Publishing Group, 27 Jul. 2023, [Peer-reviewed]
English, Scientific journal, Ultracompact mode multiplexers based on mosaic structure for various wavelength bands designed by Bayesian technique are investigated. C-, O-, and C + O band, TE0-TE1 2-mode multiplexers can be designed with the same footprint, by only changing the mosaic-pattern, showing the great flexibility of mosaic-based devices. Bayesian direct binary search method is used for the design, and it is demonstrated that the Bayesian technique is superior to conventional design method in terms of the best-structure search for the same number of iterations. The designed devices are fabricated for Si-waveguide platform, and the proof-of-concept results are obtained. These results indicate that the mosaic-based devices are promising candidates for future compact optical transceivers. - Design of silica-PLC LP11 mode rotator based on adiabatic mode conversion
Takanori Sato; Takeshi Fujisawa; Masaki Wada; Takayoshi Mori; Taiji Sakamoto; Ryota Imada; Takashi Matsui; Kazuhide Nakajima; Kunimasa Saitoh
Optics Express, 17 Jul. 2023, [Peer-reviewed], [Lead author, Corresponding author]
Scientific journal - Weakly Coupled Homogeneous 3-Mode 4-Core Fiber With Standard Cladding Diameter
Yuto Sagae; Takashi Matsui; Takayoshi Mori; Taiji Sakamoto; Taro Iwaya; Takanori Sato; Kunimasa Saitoh; Kazuhide Nakajima
Journal of Lightwave Technology, 15 Jun. 2023, [Peer-reviewed]
Scientific journal - Channel Prediction Based on Multipath Delay Estimation for Sub-Terahertz-Band Communications
望月大瑚; 西村寿彦; 佐藤孝憲; 小川恭孝; 萩原淳一郎; 大鐘武雄
電子情報通信学会論文誌 B(Web), J106-B, 6, 361, 372, 電子情報通信学会, 01 Jun. 2023, [Peer-reviewed]
Japanese, A sub-Terahertz band above 100 GHz will be used in 6G for extremely high-speed communication. In such a high frequency band, channels change rapidly in time-varying environments. The channel information obtained using pilot symbols may deviate from the actual channel information over time, resulting in degradation of channel characteristics. Thus, it is expected to be effective to predict channels at a future time. Since the number of multipaths in sub-THz bands is extremely small, we can resolve them and predict the channel. In this paper, we assume a MIMO system with a hybrid beamforming architecture, and resolve multipaths incident on a subarray in the delay domain with FISTA, one of the compressed sensing algorithms. Using the resolved multipaths, we predict the future channels. It is shown that the prediction technique works well, and that we can achieve the normalized mean square error from -30 dB to -20 dB. - Investigation of heterogeneous step-index 2LP-mode multi-core fibers based on a two-ring layout with standard cladding diameter
Zheyu Zhao; Yizhou Wang; Takanori Sato; Takeshi Fujisawa; Kunimasa Saitoh
OPTICS CONTINUUM, 2, 5, 1137, 1147, May 2023, [Peer-reviewed]
English, Scientific journal - Mode converter using bent and twisted coupled-multicore fibers for group delay spread reduction
Takanori Sato; Kazushi Homma; Takeshi Fujisawa; Yuto Sagae; Taiji Sakamoto; Takashi Matsui; Kazuhide Nakajima; Kunimasa Saitoh
Optical Fiber Technology, May 2023, [Lead author, Corresponding author]
English, Scientific journal - 6-mode and 10-mode photonic lantern mode multi/demultiplexers based on silica planar lightwave circuit
Han Wang; Takeshi Fujisawa; Takanori Sato; Takayoshi Mori; Taiji Sakamoto; Yoko Yamashita; Ryota Imada; Kazuhide Nakajima; Kunimasa Saitoh
OPTICS COMMUNICATIONS, 529, Feb. 2023, [Lead author]
English, Scientific journal - Design of Three-Mode Dual-step Index Pure Silica Core Fiber with Low Differential Mode Delay and Low Loss Characteristics
Taro Iwaya; Yuto Sagae; Takayoshi Mori; Taiji Sakamoto; Takashi Matsui; Takanori Sato; Kunimasa Saitoh; Kazuhide Nakajima
Proceedings of SPIE - The International Society for Optical Engineering, 12429, 2023
International conference proceedings - Relationship between Polarization Mode Dispersion and Crosstalk in Heterogeneous Multi-core Fibers with Different Cladding Diameters
Gustavo Ocampo; Takanori Sato; Takeshi Fujisawa; Mayu Nakagawa; Kunimasa Saitoh
2023 Optical Fiber Communications Conference and Exhibition, OFC 2023 - Proceedings, 2023
International conference proceedings - Design of Double-Cladding Heterogeneous 2LP-Mode 6-Core Fiber with Two-Ring Layout
Zheyu Zhao; Takanori Sato; Takeshi Fujisawa; Taro Iawaya; Yuto Sagae; Taiji Sakamoto; Takashi Matsui; Kazuhide Nakajima; Kunimasa Saitoh
2023 Opto-Electronics and Communications Conference, OECC 2023, 2023
International conference proceedings - Proposal of an ultra-compact mode multiplexer using air-hole type photonic crystal waveguides
Han Wang; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh
2023 Opto-Electronics and Communications Conference, OECC 2023, 2023
International conference proceedings - Proposal of 5-mode multiplexer using pillar type photonic crystal waveguides
Han Wang; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh
28th Microoptics Conference, MOC 2023, 2023
International conference proceedings - S+C+L Band Tapered Asymmetric Directional Coupler for Broadband Polarization Splitter-Rotator
Shin'Ei Ochiai; Takeshi Fujisawa; Kodai Nakamura; Takanori Sato; Makoto Okano; Kunimasa Saitoh
28th Microoptics Conference, MOC 2023, 2023
International conference proceedings - Wavelength insensitive three-mode directional coupler designed by wavefront matching method for broadband mode-dependent-loss equalizer
Ryoto Ima; Takeshi Fujisawa; Masaki Wada; Takayoshi Mori; Taiji Sakamoto; Ryota Imada; Takanori Sato; Takashi Matsui; Kazuhide Nakajima; Kunimasa Saitoh
28th Microoptics Conference, MOC 2023, 2023
International conference proceedings - High Tolerant Design of Peltier-Free Si Wavelength Filter Using Mach-Zehnder Interferometer for DWDM Application
Kengo Maeda; Takanori Sato; Takeshi Fujisawa; Takuya Mitarai; Takuo Hiratani; Takuya Okimoto; Tsutomu Ishikawa; Naoya Kono; Naoki Fujiwara; Hideki Yagi; Kunimasa Saitoh
28th Microoptics Conference, MOC 2023, 2023
International conference proceedings - Design of PLC E
31 -E13 and E-LP tapered mode converters using fast quasiadiabatic dynamics
Han Wang; Takeshi Fujisawa; Takanori Sato; Masaki Wada; Takayoshi Mori; Taiji Sakamoto; Ryota Imada; Takashi Matsui; Kazuhide Nakajima; Kunimasa Saitoh
IEICE Electronics Express, 20, 23, 2023
Scientific journal - A near-optimal stochastic MIMO signal detection with a mixture of t-distribution prior.
Junichiro Hagiwara; Kazushi Matsumura; Hiroki Asumi; Yukiko Kasuga; Toshihiko Nishimura; Takanori Sato; Yasutaka Ogawa; Takeo Ohgane
CoRR, abs/2301.03196, 2023
Scientific journal - Electro-optic Modulator with Tunable Multimode Interference Couplers Based on LiNbO$_{3}$ Waveguides and Optical Single-Sideband Modulation
Shotaro Yasumori; Takanori Sato; Keita Morimoto; Tadashi Kawai; Akira Enokihara; Shinya Nakajima; Atsushi Kanno
Journal of Lightwave Technology, 2023
Scientific journal - Sub-Terahertz MIMO Spatial Multiplexing in Indoor Propagation Environments
OGAWA Yasutaka; UTSUNO Taichi; NISHIMURA Toshihiko; OHGANE Takeo; SATO Takanori
IEICE Transactions on Communications, E105.B, 10, 1130, 1138, The Institute of Electronics, Information and Communication Engineers, 01 Oct. 2022, [Peer-reviewed], [Invited]
English, A sub-Terahertz band is envisioned to play a great role in 6G to achieve extreme high data-rate communication. In addition to very wide band transmission, we need spatial multiplexing using a hybrid MIMO system. A recently presented paper, however, reveals that the number of observed multipath components in a sub-Terahertz band is very few in indoor environments. A channel with few multipath components is called sparse. The number of layers (streams), i.e. multiplexing gain in a MIMO system does not exceed the number of multipaths. The sparsity may restrict the spatial multiplexing gain of sub-Terahertz systems, and the poor multiplexing gain may limit the data rate of communication systems. This paper describes fundamental considerations on sub-Terahertz MIMO spatial multiplexing in indoor environments. We examined how we should steer analog beams to multipath components to achieve higher channel capacity. Furthermore, for different beam allocation schemes, we investigated eigenvalue distributions of a channel Gram matrix, power allocation to each layer, and correlations between analog beams. Through simulation results, we have revealed that the analog beams should be steered to all the multipath components to lower correlations and to achieve higher channel capacity. - Mach-Zehnder Electro-optic Modulator with Multimode Interference Couplers of LiNbO
3 Waveguides for Single Sideband Modulation
Shotaro Yasumori; Anna Hirai; Takanori Sato; Keita Morimoto; Tadashi Kawai; Akira Enokihara; Shinya Nakajima; Atsushi Kanno
2022 IEEE International Topical Meeting on Microwave Photonics, MWP 2022 - Proceedings, Oct. 2022, [Peer-reviewed]
English, International conference proceedings - Proposal of mosaic-based 2 × 2 3-dB couplers for prospective on-chip communication in mid-infrared wavelengths around 2.1 µm
Taichi Muratsubaki; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh
Journal of the Optical Society of America B, 39, 9, 2522, 2522, Optica Publishing Group, 01 Sep. 2022, [Peer-reviewed]
Scientific journal, We propose two types of mosaic-based 3-dB couplers for wavelengths around 2.1 µm. For type I, the proposed device provides excess loss of dB and imbalance of over the wavelength range from 2.06 to 2.14 µm. Compared with the standard multimode-interference-based 3-dB coupler, the imbalance is improved by . For type II, coupling length in the multimode-interference region is about three times shorter than the one based on multimode-interference theory. It provides excess loss of and imbalance of over the wavelength range from 2.06 to 2.14 µm. Both proposed devices show high fabrication tolerance to hole diameter variation. Especially for type II, the fabrication-tolerant direct binary search was effective to obtain such a structure. These mosaic-based 3-dB couplers will play an important role in highly integrated photonic circuits. - Parameter-Learned AMP for MIMO Signal Detection
Mari Miyoshi; Wakaba Tsujimoto; Toshihiko Nishimura; Takanori Sato; Takeo Ohgane; Yasutaka Ogawa; Junichiro Hagiwara
2022 IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS), IEEE, 24 Aug. 2022
International conference proceedings - An electro-optic full adder designed with coupled Si ring resonators for highly dense integration
Takanori Sato; Akira Enokihara
Results in Optics, 8, 100230, 100230, Elsevier BV, Aug. 2022, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal, 13264207 - Mach-Zehnder Optical Modulator Integrated with Tunable Multimode Interference Coupler of Ti:LiNbO
3 Waveguides for Controlling Modulation Extinction Ratio
Anna Hirai; Yuichi Matsumoto; Takanori Sato; Tadashi Kawai; Akira Enokihara; Shinya Nakajima; Atsushi Kanno; Naokatsu Yamamoto
IEICE Transactions on Electronics, E105.C, 8, 385, 388, Aug. 2022, [Peer-reviewed]
Scientific journal - Comparison of Scalar and Vector WFM Method Through the Design of High-Δ Waveguide Lenses
Yusuke Sawada; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh
IEEE Photonics Technology Letters, 34, 10, 533, 536, Institute of Electrical and Electronics Engineers (IEEE), 15 May 2022, [Peer-reviewed]
English, Scientific journal - A Novel Algorithm of Wavefront-Matching Method for Stable and Efficient Design of Si Waveguides
Yusuke Sawada; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh
IEEE Photonics Technology Letters, 34, 7, 359, 362, Institute of Electrical and Electronics Engineers (IEEE), 01 Apr. 2022, [Peer-reviewed]
English, Scientific journal - Direct-binary-search algorithm for fabrication-tolerant photonic-crystal-like subwavelength structures and its application to a four-mode waveguide crossing in 2 μm waveband
Taichi Muratsubaki; Takeshi Fujisawa; Yusuke Sawada; Takanori Sato; Kunimasa Saitoh
Japanese Journal of Applied Physics, 61, 4, 042003, 042003, IOP Publishing, 01 Apr. 2022, [Peer-reviewed]
English, Scientific journal, Abstract
A novel direct-binary-search algorithm for the design of fabrication-tolerant photonic-crystal-like subwavelength structures is proposed. In the proposed method, structures based on holes with different diameters are considered to enhance the device performance under diameter variation. The usefulness of the proposed method is demonstrated through the design of a fabrication-tolerant four-mode waveguide crossing in the 2 μm waveband. With the proposed method, the transmission of TE3 mode is increased by 4.9% (for diameter of 130 nm) and 9.5% (for diameter of 150 nm) on average of 15 samples, compared with the conventional direct-binary-search method. The designed device provides insertion losses of <0.87 dB and crosstalks of <−24 dB in spite of diameter variations of ±10 nm from the ideal diameter. - Silica-PLC based mode-dependent-loss equalizer for two LP mode transmission
Takeshi Fujisawa; Takayoshi Mori; Junji Sakamoto; Yoko Yamashita; Taiji Sakamoto; Ryota Imada; Ryoto Ima; Takanori Sato; Kei Watanabe; Ryoichi Kasahara; Toshikazu Hashimoto; Kazuhide Nakajima; Kunimasa Saitoh
Optics InfoBase Conference Papers, 2022
International conference proceedings - Compact Power Splitters with Mosaic-based Structure Designed by Bayesian Direct-binary-search Method
Takuya Mitarai; Takeshi Fujisawa; Takuya Okimoto; Naoya Kono; Naoki Fujiwara; Yusuke Sawada; Taichi Muratsubaki; Takanori Sato; Kunimasa Saitoh; Hideki Yagi
OECC/PSC 2022 - 27th OptoElectronics and Communications Conference/International Conference on Photonics in Switching and Computing 2022, 2022
International conference proceedings - Analysis of Crosstalk Dependence on Cladding Diameter in Heterogeneous Multi-core Fibers by Considering Polarization-mode Coupling Effects
Gustavo Ocampo; Takanori Sato; Takeshi Fujisawa; Yoshimichi Amma; Kunimasa Saitoh
OECC/PSC 2022 - 27th OptoElectronics and Communications Conference/International Conference on Photonics in Switching and Computing 2022, 2022
International conference proceedings - A 125-μm Cladding Diameter Uncoupled 3-mode 4-core Fibre with the Highest Core Multiplicity Factor
Yuto Sagae; Takashi Matsui; Taiji Sakamoto; Taro Iwaya; Takayoshi Mori; Takanori Sato; Kunimasa Saitoh; Kazuhide Nakajima
2022 European Conference on Optical Communication, ECOC 2022, 2022
International conference proceedings - Cascaded Wavefront-Matching-Method Designed Mode-Exchangers for MDL Management in MDM Transmission
Yuichi Asama; Takeshi Fujisawa; Takanori Sato; Takayoshi Mori; Taiji Sakamoto; Ryota Imada; Yoko Yamashita; Kazuhide Nakajima; Kunimasa Saitoh
Optics InfoBase Conference Papers, 2022
International conference proceedings - A Proposal of an End-to-End DoA Estimation System Aided by Deep Learning
Daniel Akira Ando; Toshihiko Nishimura; Takanori Sato; Takeo Ohgane; Yasutaka Ogawa; Junichiro Hagiwara
International Symposium on Wireless Personal Multimedia Communications, WPMC, 2022-October, 98, 103, 2022
International conference proceedings - A novel MIMO signal detection method using Hamiltonian Monte Carlo approach
K. Matsumura; J. Hagiwara; T. Nishimura; T. Ohgane; Y. Ogawa; T. Sato
Proc. of The 24th International Symposium On Wireless Personal Multimedia Communications (WPMC 2021), Dec. 2021, [Peer-reviewed]
English, International conference proceedings - Design of Resonant-Characteristics-Monitorable Si Wavelength Filter Using Face-To-Face Loop Mirrors for Heterogeneous Integrated Tunable Lasers
T. Sato; T. Fujisawa; T. Mitarai; T. Hiratani; T. Okimoto; T. Ishikawa; N. Kono; N. Fujiwara; H. Yagi; K. Saitoh
Proc. of IEEE International Conference on Group IV Photonics (GFP2021), Dec. 2021, [Peer-reviewed], [Lead author, Corresponding author]
International conference proceedings - Switchable mode converter for four-mode MDM system assisted by passive mode controlling device designed by wavefront matching method
Y. Sawada; T. Fujisawa; T. Sato; K. Saitoh
Proc. of The 26th Microoptics Conference (MOC 2021), Sep. 2021, [Peer-reviewed]
English, International conference proceedings - Optical multimode interference couplers of Ti:LiNbO3 waveguides and electrical tuning of power splitting ratio
Anna Hirai; Yuichi Matsumoto; Takanori Sato; Tadashi Kawai; Akira Enokihara; Shinya Nakajima; Naokatsu Yamamoto
Optics Communications, 501, 127325, 127325, Elsevier BV, Aug. 2021, [Peer-reviewed]
English, Scientific journal - Broadband silicon four-mode multi/demultiplexer designed by a wavefront matching method
Yusuke Sawada; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh
Optics Express, 29, 17, 27322, 27331, The Optical Society of America (OSA), Aug. 2021, [Peer-reviewed]
English, Scientific journal - Fabrication-Tolerant Four-Mode Waveguide Crossing Based on PhC-like Subwavelength Structures at 2 μm
T. Muratsubaki; T. Fujisawa; Y. Sawada; T. Sato; K. Saitoh
Proc. of Advanced Photonics Congress (APC 2021), Jul. 2021, [Peer-reviewed]
English, International conference proceedings - Experimental demonstration of broadband silicon 4-mode (de)multiplexer designed by wavefront-matching method
Y. Sawada; T; Fujisawa; T. Sato; K. Saitoh
Proc. of Optical Fiber Communication Conference (OFC 2021), Jun. 2021, [Peer-reviewed]
English, International conference proceedings - Ultrasmall O-band CWDM 4λ MUX based on Mosaic Structure for Dense Optical Interconnects
K. Nakamura; T. Fujisawa; Y. Sawada; T. Sato; K. Saitoh
Proc. of Conference on Lasers and Electro-Optics (CLEO 2021), May 2021, [Peer-reviewed]
English, International conference proceedings - High-tolerance CWDM4 wavelength multiplexer based on 2×2/2×1 MZ filters with polarization multiplexing
Kodai Nakamura; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh
IEICE Electronics Express, 18, 8, 20210110, 20210110, Institute of Electronics, Information and Communications Engineers (IEICE), Apr. 2021, [Peer-reviewed]
English, Scientific journal - Downlink Channel Estimation Based on Multipath Separation in an FDD MIMO System
Shiori Tosaka; Toshihiko Nishimura; Takeo Ohgane; Yasutaka Ogawa; Junichiro Hagiwara; Takanori Sato
PROCEEDINGS OF IEEE VTS APWCS 2021: 2021 17TH IEEE VTS ASIA PACIFIC WIRELESS COMMUNICATIONS SYMPOSIUM (APWCS), 2021
English, International conference proceedings - A consideration on accuracy improvement in DOA estimation of two targets with deep learning
Y. Kase; T. Nishimura; T. Ohgane; Y. Ogawa; T. Sato; D. Kitayama; Y. Kishiyama
Proc. of The 2020 International Conference on Emerging Technologies for Communications (ICETC 2020), Dec. 2020, [Peer-reviewed]
English, International conference proceedings - A preliminary study on behavior of GaBP messages in massive MIMO signal detection
D. A. Ando; T. Nishimura; T. Ohgane; Y. Ogawa; J. Hagiwara; T. Sato
Proc. of The 2020 International Conference on Emerging Technologies for Communications (ICETC 2020), Dec. 2020, [Peer-reviewed]
English, International conference proceedings - Design and fabrication of MMI optical coupler using Ti-diffused lithium niobate waveguides
A. Hirai; T. Sato; T. Kawai; A. Enokihara; S. Nakajima; N. Yamamoto
Proc. of The 2020 International Topical Meeting on Microwave Photonics (MWP 2020), Nov. 2020, [Peer-reviewed]
English, International conference proceedings - Electro-Optic Modulator for Compensation of Third-Order Intermodulation Distortion Using Frequency Chirp Modulation
Daichi Furubayashi; Yuta Kashiwagi; Takanori Sato; Tadashi Kawai; Akira Enokihara; Naokatsu Yamamoto; Tetsuya Kawanishi
IEICE Transactions on Electronics, E103.C, 11, 653, 660, Institute of Electronics, Information and Communications Engineers (IEICE), Nov. 2020, [Peer-reviewed]
English, Scientific journal - Control of Group Delay Spread in Randomly-Coupled Multicore Fibers
K. Saitoh; T. Fujisawa; T. Sato
Proc. of The 24th Microoptics Conference (MOC 2019), Oct. 2020, [Invited]
English, International conference proceedings - Nonreciprocity enhancement of graphene-on-Si waveguide using one-dimensional photonic crystal
K. Nakamura; T. Sato; T. Fujisawa; K. Saitoh
Proc. of Optoelectronics and Communications Conference (OECC 2020), Nov. 2019, [Peer-reviewed]
English, International conference proceedings - Ultrasmall design of a universal linear circuit based on microring resonators
Takanori Sato; Akira Enokihara
Optics Express, 27, 23, 33005, 33010, The Optical Society of America (OSA), Nov. 2019, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Cladding diameter dependence of inter-core crosstalk in heterogeneous multicore fibers
K. Nishimura; T. Sato; T. Fujisawa; Y. Amma; K. Takenaga; K. Aikawa; K. Saitoh
Proc. of 24th Optoelectronics and Communications Conference / International Conference on Photonics in Switching and Computing 2019 (OECC/PSC 2019), Jul. 2019, [Peer-reviewed]
English, International conference proceedings - Ultra-robust design of mode (de)multiplexer based on asymmetrical directional coupler using wire and one-side rib waveguides
T. Sato; T. Fujisawa; K. Saitoh
Proc. of 24th Optoelectronics and Communications Conference / International Conference on Photonics in Switching and Computing 2019 (OECC/PSC 2019), Jul. 2019, [Peer-reviewed], [Lead author, Corresponding author]
English, International conference proceedings - Simple GDS estimation method for coupled multicore fibers with various core layouts
Y. Yasui; K. Yoshida; T. Sato; T. Fujisawa; T. Sakamoto; T. Matsui; K. Tsujikawa; K. Nakajima; K. Saitoh
Proc. of International Symposium on Extremely Advanced Transmission Technologies (EXAT 2019, May 2019, [Peer-reviewed]
English, International conference proceedings - Optimum index profile of few-mode coupled multicore fibers for reducing the group delay spread
Kazuki Yoshida; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh
Optics Express, 27, 11, 16281, 16295, The Optical Society of America (OSA), May 2019, [Peer-reviewed]
English, Scientific journal - Low-loss and fabrication-tolerant Si four-wavelength multiplexer using higher-order mode for 100/400GbE
J. Takano; T. Fujisawa; T. Sato; Y. Sawada; T. Sakamoto; T. Matsui; K. Tsujikawa; K. Nakajima; K. Saitoh
Proc. of Optical Fiber Communication Conference (OFC 2019), Mar. 2019, [Peer-reviewed]
English, International conference proceedings - First experimental demonstration of wavefront-matching-method-designed silicon mode converters
Y. Sawada; T. Fujisawa; T. Sato; K. Saitoh
Proc. of Optical Fiber Communication Conference (OFC 2019), Mar. 2019, [Peer-reviewed]
English, International conference proceedings - CMOS-compatible Si-wire polarization beam splitter based on wavelength-insensitive coupler
Yusuke Sawada; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh
IEICE Electronics Express, 16, 8, 20181126, 20181126, The Institute of Electronics, Information and Communication Engineers (IEICE), Feb. 2019, [Peer-reviewed]
English, Scientific journal - All-Optical Diode Suppressing Broadband Backward Transmission Using Single- and Four-Port Photonic Crystal Cavities
Takanori Sato; Takeshi Fujisawa; Kunimasa Saitoh
IEEE Photonics Journal, 11, 1, 4900214, 4900214, Institute of Electrical and Electronics Engineers (IEEE), Dec. 2018, [Peer-reviewed]
English, Scientific journal - GeSn/SiGeSn multiple-quantum-well electroabsorption modulator with taper coupler for mid-infrared Ge-on-Si platform
Minami Akie; Takeshi Fujisawa; Takanori Sato; Masakazu Arai; Kunimasa Saitoh
IEEE Journal of Selected Topics in Quantum Electronics, 24, 6, 3400208, 3400208, The Institute of Electrical and Electronics Engineers (IEEE), Nov. 2018, [Peer-reviewed]
English, Scientific journal - Suppression of group-delay spread in coupled two-LP-mode four-core fiber
T. Sato; K. Yoshida; T. Fujisawa; T. Sakamoto; T. Matsui; K. Tsujikawa; K. Nakajima; K. Saitoh
Proc. of IEEE Photonics Conference (IPC 2018), Oct. 2018, [Peer-reviewed], [Lead author, Corresponding author]
English, International conference proceedings - Development of the Wavefront Matching Method Based on the 3-D Finite-Element Method and Its Application to Si-wire Mode Converters
Yusuke Sawada; Takanori Sato; Takeshi Fujisawa; Kunimasa Saitoh
Journal of Lightwave Technology, 36, 17, 3652, 3659, The Institute of Electrical and Electronics Engineers (IEEE), Sep. 2018, [Peer-reviewed]
English, Scientific journal - Erratum: Full-vector finite-element beam propagation method for helicoidal waveguides and its application to twisted photonic crystal fibers
Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh
Journal of Lightwave Technology, 36, 18, 4211, 4212, The Institute of Electrical and Electronics Engineers (IEEE), Sep. 2018, [Peer-reviewed]
English, Scientific journal - A broadband silicon two-mode multiplexer designed by wavefront matching method
Y. Sawada; T. Sato; T. Fujisawa; K. Saitoh
Proc. of OptoElectronics and Communications Conference (OECC 2018), Jul. 2018, [Peer-reviewed]
English, International conference proceedings - Proposal of Si four-wavelength multiplexer using higher-order mode for 100GbE
J. Takano; T. Sato; Y. Sawada; T. Fujisawa; T. Sakamoto; T. Matsui; K. Tsujikawa; K. Nakajima; K. Saitoh
Proc. of OptoElectronics and Communications Conference (OECC 2018), Jul. 2018, [Peer-reviewed]
English, International conference proceedings - Novel all-optical diode based on single-port and four-port photonic crystal cavities
T. Sato; T. Fujisawa; K. Saitoh
Proc. of OptoElectronics and Communications Conference (OECC 2018), Jul. 2018, [Peer-reviewed], [Lead author, Corresponding author]
English, International conference proceedings - Beam propagation analysis of optical activity and circular dichroism in helically twisted photonic crystal fiber
Sota Nakano; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh
Japanese Journal of Applied Physics, 57, 8S2, 08PF06, 08PF06, IOP Publishing, Jul. 2018, [Peer-reviewed]
English, Scientific journal - Design of a high-forward-transmission all-optical diode based on cascaded side-coupled photonic crystal cavities
Takanori Sato; Takeshi Fujisawa; Kunimasa Saitoh
Journal of the Optical Society of America B: Optical Physics, 34, 12, 2493, 2500, The Optical Society of America (OSA), Dec. 2017, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Coiling size dependence of group delay spread in coupled multicore fibers without intentional twisting
Kunimasa Saitoh; Takeshi Fujisawa; Takanori Sato
Journal of Lightwave Technology, 35, 20, 4559, 4566, The Institute of Electrical and Electronics Engineers (IEEE), Oct. 2017, [Peer-reviewed]
English, Scientific journal - Group delay spread analysis of few-mode, coupled 3-core fibres: Optimum index profile and maximum transmission distance for strong coupling regime
K. Yoshida; T. Fujisawa; T. Sato; K. Saitoh
Proc. of European Conference on Optical Communications (ECOC 2017), Sep. 2017, [Peer-reviewed]
English, International conference proceedings - High-forward-transmission all-optical diode based on cascaded L3 photonic crystal cavities
T. Sato; T. Fujisawa; K. Saitoh
Proc. of The 24th Congress of International Commission for Optics (ICO-24), Aug. 2017, [Peer-reviewed], [Lead author, Corresponding author]
English, International conference proceedings - A compact and low-loss GeSn electroabsorption modulator using vertical multimode interference for mid-infrared Ge-on-Si platform
M. Akie; T. Sato; M. Arai; T. Fujisawa; K. Saitoh
Proc. of 2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR 2017), Jul. 2017, [Peer-reviewed]
English, International conference proceedings - Design and analysis of weakly- and strongly-coupled multicore fibers
K. Saitoh; T. Fujisawa; T. Sato
Proc. of Photonic Networks and Devices in Proceedings Advanced Photonics 2017 (IPR, NOMA, Sensors, Networks, SPPCom, PS), Jul. 2017, [Invited]
English, International conference proceedings - Full-vector finite-element beam propagation method for helicoidal waveguides and its application to twisted photonic crystal fibers
Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh
Journal of Lightwave Technology, 35, 14, 2894, 2901, The Institute of Electrical and Electronics Engineers (IEEE), Jul. 2017, [Peer-reviewed]
English, Scientific journal - Highly efficient GeSn electroabsorprtion modulator using higher-order-mode for mid-infrared Ge-on-Si platform
T. Sato; M. Akie; M. Arai; T. Fujisawa; K. Saitoh
Proc. of Conference on Lasers and Electro-Optics (CLEO 2017), May 2017, [Peer-reviewed], [Lead author, Corresponding author]
English, International conference proceedings - Low-loss, compact, and fabrication-tolerant Si-wire 90° waveguide bend using clothoid and normal curves for large scale photonic integrated circuits
Takeshi Fujisawa; Shuntaro Makino; Takanori Sato; Kunimasa Saitoh
Optics Express, 25, 8, 9150, 9159, The Optical Society of America (OSA), Apr. 2017, [Peer-reviewed]
English, Scientific journal - Ultimately low-loss and compact Si wire 90° waveguide bend composed of clothoid and normal curves for dense optical interconnect PICs
S. Makino; M. Suga; T. Sato; T. Fujisawa; K. Saitoh
Proc. of Optical Fiber Communication Conference (OFC 2017), Mar. 2017, [Peer-reviewed]
English, International conference proceedings - A simple design method of reflection-suppressed photonic crystal cavity with asymmetric waveguides
T. Sato; S. Makino; T. Fujisawa; K. Saitoh
Proc. of IEEE Photonics Conference (IPC 2016), Oct. 2016, [Peer-reviewed], [Lead author, Corresponding author]
English, International conference proceedings - Design of a reflection-suppressed all-optical diode based on asymmetric L-shaped nonlinear photonic crystal cavity
Takanori Sato; Shuntaro Makino; Takeshi Fujisawa; Kunimasa Saitoh
Journal of the Optical Society of America B: Optical Physics, 33, 1, 54, 61, The Optical Society of America (OSA), Jan. 2016, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Three-dimensional finite-element time-domain beam propagation method and its application to 1-D photonic crystal-coupled resonator optical waveguide
Shuntaro Makino; Takanori Sato; Yuhei Ishizaka; Takeshi Fujisawa; Kunimasa Saitoh
Journal of Lightwave Technology, 33, 18, 3836, 3842, The Institute of Electrical and Electronics Engineers (IEEE), Sep. 2015, [Peer-reviewed]
English, Scientific journal - A rigorous definition of nonlinear parameter γ and effective area A
eff for photonic crystal optical waveguides
Takanori Sato; Shuntaro Makino; Yuhei Ishizaka; Takeshi Fujisawa; Kunimasa Saitoh
Journal of the Optical Society of America B: Optical Physics, 32, 6, 1245, 1251, The Optical Society of America (OSA), Jun. 2015, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Three-dimensional finite-element mode-solver for nonlinear periodic optical waveguides and its application to photonic crystal waveguides
Takanori Sato; Shuntaro Makino; Yuhei Ishizaka; Takeshi Fujisawa; Kunimasa Saitoh
Journal of Lightwave Technology, 32, 21, 3409, 3417, The Institute of Electrical and Electronics Engineers (IEEE), Nov. 2014, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Investigation of nonlinear characteristics in a 1-D slotted photonic crystal coupled resonator optical waveguide with modulated mode-gap
T. Sato; S. Makino; Y. Ishizaka; K. Saitoh
Proc. of 2014 OptoElectronics and Communication Conference and Australian Conference in Optical Fibre Technology (OECC/ACOFT 2014), Jul. 2014, [Peer-reviewed], [Lead author, Corresponding author]
English, International conference proceedings
- PLC mode control device for mode-division multiplexing transmission
Takanori Sato; Kunimasa Saitoh, Journal of the ITU Association of Japan, 54, 6, 30, 31, Jun. 2024, [Lead author]
Japanese, Introduction commerce magazine - エレクトロニクスとフォトニクスの融合を目指した光通信・光演算技術の研究開発
佐藤 孝憲, NET JOURNAL 75, 75, Feb. 2022, [Lead author, Corresponding author]
Japanese, Introduction research institution - エレクトロニクスとフォトニクスの融合を目指して
佐藤 孝憲, 北海道大学大学院情報科学院 広報誌 IST NEWS, 62, Oct. 2020, [Lead author, Corresponding author]
Japanese, Introduction research institution
- 電子情報通信学会誌 特集 6Gがひらく2030年の超スマート社会
西村 寿彦; 佐藤 孝憲; 小川 恭孝; 大鐘 武雄, 超スマート化社会を支えるICTの更なる進化「2-12 光の領域と融合する無線通信」
一般社団法人 電子情報通信学会, May 2021, [Contributor]
- モード分割多重伝送のための導波路型モード制御デバイスの最新成果
佐藤 孝憲
光通信インフラの飛躍的高度化に関するシンポジウム -EXAT研究活動開15年の節目を迎えて-, 11 Dec. 2023, Japanese, Invited oral presentation
[Invited] - 電子デバイスと光デバイスの融合に向けて
佐藤 孝憲
第8回北大・部局横断シンポジウム, 28 Oct. 2022, Japanese, Poster presentation
[Invited] - Siフォトニクスを用いたアナログRoF信号のMIMO処理デバイス
佐藤 孝憲
第21回 国際ナノテクノロジー総合展・技術会議 (nano tech 2022), Jan. 2022, Japanese, Public symposium
26 Jan. 2022 - 28 Jan. 2022 - Optical MIMO Signal Processing Based on Planar Lightwave Circuit
T. Sato
4th International Workshop on Photonics applied to Electromagnetic Measurements in Sapporo (PEM2021), 30 Nov. 2021, English, Invited oral presentation
[Invited] - Silicon Photonics for Optical Processing Unit
Takanori Sato
The 1st Hokkaido Young Professionals Workshop, 14 Oct. 2021, English, Keynote oral presentation
[Invited] - 電子デバイスと光デバイスの融合に向けて
佐藤 孝憲
第7回北大・部局横断シンポジウム, 01 Oct. 2021, Japanese, Others
[Invited] - シリコン光演算回路の研究動向
佐藤 孝憲
IEEE 札幌支部 学術講演会, 21 Dec. 2020, Japanese, Invited oral presentation
[Invited] - 電子デバイスの限界を光で突破できるか
佐藤 孝憲
第6回北大・部局横断シンポジウム, 19 Oct. 2020, Japanese, Others
[Invited] - シリコンリング共振器を用いた位相シフタとパワーディバイダの試作評価
佐藤 孝憲; 榎原 晃
2020年電子情報通信学会ソサイエティ大会, Sep. 2020 - シリコンリング共振器を用いた光演算回路の飛躍的な演算次数増大に向けた検討
佐藤 孝憲; 榎原 晃
2020年電子情報通信学会総合大会, Mar. 2020 - Beam propagation method analysis based on cylindrical coordinate system for 90-degree bent Si nanowire waveguide
Takanori Sato; Takeshi Fujisawa; Kunimasa Saitoh
IEICE Society Conference 2019, 10 Sep. 2019, Japanese, Oral presentation
Osaka, Japan, [Domestic Conference] - Investigation of dispersion characteristics in optical device manipulating spatial modes
Takanori Sato; Yusuke Sawada; Takeshi Fujisawa; Kunimasa Saitoh
IEICE Society Conference 2018, 11 Sep. 2018, Japanese, Oral presentation
Ishikawa, [Domestic Conference] - Investigation of optical isolator based on photonic intraband transition using one-dimensional photonic crystal optical waveguide
Takanori Sato; Takeshi Fujisawa; Kunimasa Saitoh
IEICE General Conference 2018, 20 Mar. 2018, Japanese, Oral presentation
Tokyo, [Domestic Conference] - Application of cascaded side-coupled Si photonic crystal cavities −Add-drop filter and all-optical diode−
Takanori Sato; Takeshi Fujisawa; Kunimasa Saitoh
Integrated Photonic Devices and their Applications (IPDA), 09 Nov. 2017, Japanese, Oral presentation
Ishikawa, [Domestic Conference] - Fabrication of low-loss and compact Si wire 90-degree bent waveguide using clothoid curves
Takanori Sato; Masahiro Suga; Shuntaro Makino; Takeshi Fujisawa; Kunimasa Saitoh
IEICE General Conference 2017, 22 Mar. 2017, Japanese, Oral presentation
Aichi, [Domestic Conference] - The design method of reflection-suppressed all-optical diode based on asymmetric nonlinear L-shaped photonic crystal nanocavity
Takanori Sato; Shuntaro Makino; Takeshi Fujisawa; Kunimasa Saitoh
Technical Committee on OptoElectronics (OPE), 29 Oct. 2015, Japanese, Oral presentation
Oita, [Domestic Conference] - A study on calculation method of nonlinear parameterγ for periodic optical waveguides
Takanori Sato; Shuntaro Makino; Yuhei Ishizaka; Takeshi Fujisawa; Kunimasa Saitoh
IEICE General Conference 2015, 10 Mar. 2015, Japanese, Oral presentation
Shiga, [Domestic Conference] - Investigation of nonlinear characteristics in photonic crystal coupled resonator optical waveguides
Takanori Sato; Shuntaro Makino; Yuhei Ishizaka; Kunimasa Saitoh
Technical Committee on Microwave and Millimeter-wave Photonics (MWP), 17 Apr. 2014, Japanese, Oral presentation
Hokkaido, [Domestic Conference] - Investigation of nonlinear characteristics in 1-D PC-CROW using 3-D finite-element mode-solver
Takanori Sato; Shuntaro Makino; Yuhei Ishizaka; Kunimasa Saitoh
IEICE General Conference 2014, 18 Mar. 2014, Japanese, Oral presentation
Niigata, [Domestic Conference]
- フォトニックネットワーク特論, 2024年, 修士課程, 情報科学院
- フォトニックネットワーク特論, 2024年, 博士後期課程, 情報科学研究科
- フォトニックネットワーク特論, 2024年, 博士後期課程, 情報科学院
- 光・電波サイエンス, 2024年, 学士課程, 工学部
- フォトニックネットワーク基礎, 2024年, 学士課程, 工学部
- ディジタルネットワーク, 2024年, 学士課程, 工学部
- コンピュータ工学, 2024年, 学士課程, 工学部
- Sep. 2019 - Present
The Japan Society of Applied Physics - Mar. 2016 - Present
Optica (formerly OSA)) - Jan. 2016 - Present
IEEE - Jan. 2014 - Present
IEICE
- Development of MIMO signal processor for analog RoF using optical phase control techniques
Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists
Apr. 2022 - Mar. 2025
Takanori Sato
Japan Society for the Promotion of Science, Grant-in-Aid for Early-Career Scientists, Hokkaido University, Principal investigator, 22K14295 - Research on Electro-optic devices using multi-mode interference waveguides
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
Apr. 2020 - Mar. 2024
榎原 晃; 佐藤 孝憲
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), University of Hyogo, Coinvestigator, 20K04601 - Development of highly-integrated on-chip optical processor
Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists
Apr. 2019 - Mar. 2022
佐藤 孝憲
本研究では、既存の電子デバイス性能の限界を突破し得る要素技術の1つとして「光演算プロセッサ」に着目し、光で演算を行う行列積演算回路と光全加算器の設計・開発に取り組んできた。
令和元年度は初期検討として、簡易な構造により素子を小型化できるシリコンリング共振器を用いた行列積演算回路を設計した。3×3ユニタリ行列積演算が可能であることを示し、数値解析結果より良好な特性が得られることを確認した。一般的なシリコンリング共振器では、1つのリングにバス導波路とアクセス導波路を接続するのに対して、2つのリングを結合させたシリコンリング共振器を用いることで、透過帯域をフラットにするだけではなく、多入力・多出力の光配線レイアウトの簡素化に成功している。また、直線導波路に対して熱や電圧を加えるタイプの位相シフタやマッハツェンダ干渉計を用いた従来のデバイスよりも、1/10から1/100程度まで小型化可能であることを明らかにした。一般に、回路構成に共振器を用いることにより、デバイスサイズと遅延のトレードオフが生じることが問題視されているが、Q値が800程度のゆるやかな共振ピークを持つリング共振器を2段に結合した場合、共振器通過時の遅延（出力が定常状態となるまでの時間）が5ps程度となり、実用上問題ないことを確認した。さらに、提案構造に用いられているシリコンリング共振器は、光全加算器の構成にも取り入れることが可能であり、現在その設計に取りかかっている。
Japan Society for the Promotion of Science, Grant-in-Aid for Early-Career Scientists, University of Hyogo, Hokkaido University, Principal investigator, 19K15037 - 全光信号処理のための超小型全光ダイオードの実現に向けた研究
Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows
Apr. 2017 - Mar. 2019
佐藤 孝憲
光通信機器における信号処理を全て光信号で行う「全光信号処理」を実現する全光デバイスは、デバイスの消費電力を３桁程度削減可能であるものとして期待されている。これまで、２０１０年には全光スイッチ、２０１２年には全光メモリが実験的に確認されたことで，世界的な注目を集めてきたが、光整流ダイオード（全光ダイオード）については、順方向透過率や整流特性、波長特性が乏しく、未だ実現が困難な状況である。そこで本研究では、優れた整流特性および高い実現可能性を有する全光ダイオードを設計開発することを目的として、フォトニック結晶共振器を用いたシリコン全光ダイオードの研究を進めてきた。
前年度までに、従来報告されてきた全光ダイオードと比較して、より実現性の高く、高い透過特性および整流特性を有するダイオードが実現可能であることを理論的に確認した。
２年目となる本年度は、前年度設計した全光ダイオードを作製し、測定実験を行う予定であったが、フォトニック結晶デバイスを設計通りに作製することができず、ダイオード動作の実験実証までには至らなかった。具体的には、フォトニック結晶光共振器の入出力導波路部分に問題があり、空孔間隔や、曲げ導波路の配置を工夫して、シミュレーション通りの実験測定結果が得られない問題を回避した。現在、改めて設計デバイスのチップ作製を行っている最中であり、実際に実験測定のフェーズに入るのは次年度以降となる。
Japan Society for the Promotion of Science, Grant-in-Aid for JSPS Fellows, Hokkaido University, Principal investigator, 17J00378
■ Academic and Social Contribution Activities/Other
Media Coverage
- World's first demonstration of a new structural design for multi-core and multi-mode optical fiber More than 10 spatial multiplexing with less than 10 cores and reduced propagation delay difference between multimode
11 Dec. 2024
Nippon Telegraph and Telephone Corporation/Hokkaido University
(https://group.ntt/en/newsrelease/2024/12/11/241211b.html), [Internet] - World’s First Attempt at Flexible Compensation Technique for Optical Power Difference Between Spatially Multiplexed Signals: Milestone for Realizing Beyond 1-Peta-bit Class Large Capacity Optical Transmission Proposed in IOWN
27 Jun. 2022
Nippon Telegraph and Telephone Corporation/Hokkaido University
(https://www.global.hokudai.ac.jp/wp-content/uploads/2022/06/NTT-Hokudai_Planar-Lightwave-Circuit.pdf), [Internet]
